Lac Operon
In the Lac Operon, the 'i' gene codes for:
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About This Question
- Subject
- biology
- Chapter
- molecular basis of inheritance
- Topic
- lac operon
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Repressor
- Lac Operon Structure: Consists of one regulatory gene ('i') and three structural genes (z, y, a).
- i-gene: The 'i' stands for inhibitor. This gene codes for the repressor protein.
- Action: The repressor binds to the operator region in the absence of an inducer (lactose), preventing RNA polymerase from transcribing the structural genes.
- Conclusion: The 'i' gene specifically codes for the repressor protein.
This medium difficulty biology question is from the chapter molecular basis of inheritance, covering the topic of lac operon. It appeared in the 2025 exam.
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